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#1
10-02-2016, 01:45 PM
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Well I took the back off (chassis #7MT808) and tested the 21FJP22, red was low even running the filament an hour. But after the lowest level of rejuvenation it popped right up to balance with the other guns at the lower end of the green scale.
Here are some photos. At this point I take it I should remove all scanning related tubes, apply power ramping up to line voltage slowly looking for trouble, then reawaken horz then vert oscillators? What I did with my CTC4 was replace every 'lytic and paper cap before applying power but this is obviously mostly "brown dip" caps. Thanks for the feedback so far! Last edited by Hagstar; 10-02-2016 at 01:49 PM. 
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#2
10-02-2016, 03:47 PM
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no need to recap, just give it a slow start with the horz out and vert out tubes pulled, power up slow, monitor the B+, stop the variac when it gets to about 375v, check cans for heat, if all good plug in the sweep tubes, monitor the horz out cathode for current and do a full power startup. Don't be surprised if the cathode current is somewhat high, like 230ma IIRC. get it as low as you can but be warned the fly runs hot. upping the contrast makes it run hotter IIRC. Lowering the HV will lower the cathode current, but may end up with not enough horz sweep. Its a bit of an odd ball with the feedback HV regulation.
here is a video https://www.youtube.com/watch?v=1vKzh33VaWI Last edited by DaveWM; 10-02-2016 at 03:51 PM.
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